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Патент USA US3058414

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Oct. 16, 1962
Filed Oct. 27, 1958
J. S. WIDELO
METHOD AND APPARATUS FOR SPREADING
STONE AND OTHER AGGREGATES
3,058,404 1
4 Sheets-Sheet 1
INVENTOR
Oct. 16, 1962
Filed Oct. _27, 1958
/9’
J. 5. WIDELO
METHOD AND APPARATUS FOR SPREADING
STONE AND OTHER AGGREGATES
3,058,404
4 Sheets-Sheet 2
54
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66
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INVENTOR
(Av/#4114254 a
'ATTORN
Oct. 16, 1962
Filed 001;. 27, 1958
J. s. WIDELO
3,058,404
METHOD AND APPARATUS FOR SPREADING
STONE AND OTHER AGGREGATES
4 Sheets-sheet 3
31
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Oct- 16, 1962
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Filed Oct. 27, 1958
J s. WIDELO
METHOD AND APPARATUS FOR SPREADING
3,058,404
STONE AND OTHER AGGREGATES
4 Sheets-Sheet 4‘
INVENTOR
United States Patent 0
1C6
3,058,404
Patented Oct. 16, 1962
2
3,958,494
readily adaptable for spreading aggregates up to and ex
ceeding 6 in. to 8 in. and that is characterized by its
METHGB AND APPARATUS FOR SPREADING
STGNE AND {)TEIER AGGREGATES
John S. Widelo, North Hat?eld, Mass., assignor to The
Lane {Ionstruetion Corporation, hater-idea, Conrn, a cor
poration of Connecticut
Fiied Get. 27, 1958, Ser. No. 769,924
6 Claims. (£1. 94-4-6)
elements, this improved spreader can be adjusted to lay
apparatus for laying and spreading aggregates, such as
produced by wedging of the stone beneath the striker
crushed stone and the like, to form base courses for the
plate or leveling means.
simplicity, dependability and ease of operation. Through
a novel and improved arrangement and organization of
courses of any desired Width, thickness and shape.
A further object of the invention resides in the pro- vision of a novel and improved method for laying stone
that will prevent dragging of stone and thus produce a
This invention relates to the spreading of aggregates 10 resultant course having a uniform thickness and relatively
and more particularly concerns an improved method and
smooth surface free of ruts and other discontinuities
support of roadways and for the other purposes.
Spreading of aggregates to form layers of relatively
uniform thickness and density has presented a serious
problem particularly in the construction of modern
‘
A still further object of the invention resides in a novel
and improved spreader for aggregates embodying means
for automatically laying the stone in a solid compact
layer and that will effect this end rapidly and dependably
without need for highly skilled or specially trained
highways which require base courses of stone or other
material to furnish the necessary support ‘for the ?nal
operators.
surfacing material. Base courses may be of any de 20
A still further object of the invention resides in a novel
sired thickness and must be solidly packed to prevent
and improved method for spreading aggregates such as
settling when subjected to the stresses of heavy vehicular
crushed stone and the like.
tra?’ic. Inasmuch as the aggregates must be laid mechani
A still further object of the invention resides in the
cally in order to maintain costs at a minimum, and since
provision of a novel and improved spreading apparatus
it has not been possible to lay the larger aggregates by 25 for aggregates such as crushed stone and the like.
mechanical devices and produce base courses a?ording
The above and- other objects of the invention ‘will be
the necessary support, highway speci?cations generally
come more apparent from the accompanying drawings
require that aggregate sizes shall not exceed 4 in. maxi
forming part of this application.
mum and place rigid limitations on gradation. Present
In the drawings:
maximum size and gradation limitations for aggregates
‘FIGURE 1 is a side elevational view of one embodi
materially increases the cost of highway construction,
ment of the apparatus in accordance with the invention.
though the overall cost of spreading small aggregates by
FIGURE 2 is a rear fragmentary view of the spreader
mechanical means is substantially less than the cost of
box of FIGURE 1.
laying large aggregates by hand.
FIGURE 3 is a plan view of the spreader box or hopper
Another difficulty that has been encountered in spread 35 shown in ‘FIGURE 1.
ing aggregates with prior known equipment, is the drag
FIGURE 4 is a perspective View of the spreader box
effect encountered when elongated aggregates become
taken in the direction of the arrows 4—4 of FIGURE 3.
caught beneath the striker plate or leveling means on
FIGURE 5 is a perspective view similar to FIGURE 4
the spreader. This occurs by reason of the screening pro
with a ?ller plate for reducing the width of the course
cedure which will pass a piece of aggregate if it falls ~10 to be laid.
on the screen with its long axis perpendicular to the
FIGURE 6 is a cross sectional view of FIGURE 5
screen. Thus, 4 in. aggregates could have any length in
taken along the line 6-6 thereof.
excess of 4 in. and in cases where they are unusually long,
FIGURE 7 is a cross sectional view of FIGURE 1
the aggregate will catch or drag on the striker plate and
taken along the line 7—-7 thereof.
produce deep ruts and grooves in the surface of the re 45 FIGURE 8 is a cross sectional View of FIGURE 3
sultant layer which must be ?lled by hand.
taken along the 1line 8—8 thereof.
The foregoing di?iculties have been overcome with this
FIGURE 9 is an elevational view of FIGURE 3 taken
invention which provides a novel and improved method
generally in the direction of the arrow 9 with parts
and apparatus for laying all sizes of aggregates including
aggregate sizes up to and exceeding 6 in. and without '
encountering objectionable drag effect.
‘Furthermore,
gradation limitations and aggregate sizes can be materially
relaxed without a?ecting the quality of the resultant road
way. As a result, the cost of highway construction is
materially reduced and actual tests have indicated that
crushed stone courses using 6 in. material and laid in ac
cordance with the invention provides a stable and durable
base offering as much, if not more, support than small
omitted ‘for clarity.
FIGURE 10 is a fragmentary perspective view in par
tial section of the striker plate and tampers in accordance
with the invention.
‘FIGURE 11 is across sectional view of a modi?ed
embodiment of the invention.
FIGURE 12 is a perspective view of a portion of FIG
URE 1 showing the wheel mount.
FIGURE ‘13 is a fragmentary perspective view of a
further embodiment of the invention.
FIGURE 14 is a cross sectional view of the embodi
aggregates laid by prior known devices. Because ofthe
ment shown in FIGURE 13.
inherent characteristics of the equipment in accordance
FIGURE 15 is an elevational view of the embodiment
with the invention, skilled, or highly experienced person
of the invention shown in FIGURES 13 and 14.
nel are not required, for its operation.
FIGURE 16 is a diagrammatic view of another em
Another object of the invention resides in a novel and
bodiment of the invention.
.
improved method and apparatus for spreading aggregates
65
As
pointed
out
above,
the
laying
of
stone
or
other
that will produce dense and highly uniform courses and
aggregates for base courses for roadways and. other
enable the laying of successive courses side by side
purposes
has presented a serious problem and at the
without leaving gaps or gulleys between adjacent courses
present time mechanical spreading is restricted to aggre—
that heretofore have had to be ?lled or leveled by a sub
gates of 4 in. and smaller in order to produce courses
sequent hand or mechanical operations.
70 offering the support necessary for the roadways or other
Another object of the invention resides in the provi
structures to be built thereon. This invention enables the
sion of a novel and improved stone spreader that is
laying of stone considerably larger than 4 in. by me
3,058,404
4
3
chanical means and at the same time provides increased
operation and in actual practice the tampers 25 actually
compaction and resulting increased support for the over
lying structure. This end is attained through a novel and
improved arrangement of tamping devices operable to en
move into and out of positions slightly below the edge 31.
Aggregate distributing means are included within the
gage the stones being laid and cause them to form a uni
(it
formly dense layer. In addition, the invention affords
among other things, means for laying successive courses
side by side to produce a resultant smooth and uninter
rupted surface. Furthermore, the courses being laid can
spreader box in order to obtain a uniform distribution
of the stone within the box when it is discharged from a
conventional vehicle such as the truck 23, as shown in
FIGURE 1. For this purpose a central inclined ba?le
be provided with inclined and crowned surfaces to pro
32 extends generally from the top edge of the front wall
26 and slopes downwardly and rearwardly to leave a
narrowed section between the bottom edge 33 of the
duce the desired roadway surface con?guration.
central battle and the rear wall 27. The sides of the cen
While the invention may take a variety of forms, one _
embodiment is illustrated in FIGURE 1. In this ?gure
the numeral 10 denotes the driving vehicle which in the
tral ba?le 32 are sloped inwardly and inclined baffles
34 extend from the edges of the baffle 32 to the side walls
28 and 29. The opening of the spreader box adjoining
the side walls 28 and 29 is considerably greater than the
central opening so that the stone or other aggregate will
11, a pair of tracks 12, an operator’s platform 13 and
be fed downwardly at a substantially uniform rate
controls 14 for the operation of the vehicle. An aggre
throughout the entire width of the spreader. The for
gate spreader, in accordance withe the invention, is gen
ward wall 26 further includes a pair of roller assemblies
erally denoted by the numeral 15 and includes a spreader
box 'or hopper 16 secured to the tractor 1t} and tamping 20 35 for engaging the wheels 23’ of a truck 23 to displace
the truck forwardly as its load is deposited into the
means 25. More speci?cally, the spreader box is secured
spreader box during the forward motion imparted by the
to the tractor or propelling vehicle 10 by means of a
tractor or other propelling vehicle 10.
pair of adjustable A-frames each including a tie bar
instant case comprises a tractor having a suitable motor
As pointed out above, the spreader box 15, including
or link 17 and an adjustable jack 18 while the forward end
of the spreader box is supported by a pair of pivotally 25 the tamper assembly 25 is secured to the vehicle ‘by a
pair of A-frames including elements 17 and 18. More
mounted wheels 19 to facilitate maneuverability of the
speci?cally, the element 17 of each frame is in the form of
equipment. The tractor 10 is further provided with a
a link pivoted at one end to a pin 21 on the tractor and
pair of hydraulic cylinders 20 and cables 21', the latter
pivoted at the other end to a bracket 36 ?xedly secured
being ‘attached to the spreader box for lifting the entire
spreader box ‘assembly 15 about the pivotal attachment 30 to the trailing side of the tamper assembly 25, to be de
scribed. Each element 18 is adjustable in length and in
21 to the tractor 10. With the spreader box assembly
cludes a tubular member 37 rotatably supported by a
in a raised position the tractor can then be maneuvered in
knuckle 38 ?xedly attached to the top of the rear wall
the normal manner, A counterweight 22 is secured to
27 of the spreader box. An elongated, threaded member
the tractor 10 in order to counterbalance the weight of
the spreader box assembly 15 when the latter is in a 35 39 engages cooperating threads on the inside of the ro
tatable member 37 and the outer end of the member 39
raised position.
is pivotally secured to a bracket 40 carried by the link 17
In operation of the equipment shown in FIGURE 1,
at a point between its ends. With this arrangement, ad
a truck 23 loaded with stone or other aggregate is backed
justment of each element 18 to extend the length between
against the spreader box 15 until the wheels of the truck
the bracket 40 and the knuckle 38 will tend to raise the
contact cooperating rollers 24 carried on the forward
lower edge 31 of the rear wall 27. Shortening of each
wall of the spreader box 16. The body of the truck is
element 18 will lower the edge 31 of the striker plate.
raised to discharge stone into the spreader box whereupon
The use of the individual elements 18 also provides means
the tractor 10 is operated to move the spreader box and
for adjusting the level of spreader box for purposes to
the truck 23 in the direction of the arrow A until the truck
be described.
has deposited its entire load in the hopper 16. During
The mounting for wheels 119 and the associated steer
this forward motion the stone is deposited on the ground
ing mechanism may take any desired con?guration. In
surface as indicated at G to form the course C.
the illustrated embodiment of the invention each Wheel
In laying aggregates as small as 4 in. and even 3 in.,
19 is carried by a fork 41 pivotally secured at 42 to a
it is di?icult, if not impossible, to secure a uniform layer
of stone because elongated pieces of stone often become 59 bracket member 43 which includes a substantially vertical
disposed end plate 44, as will be observed'more clearly
in FIGURE 12. In this ?gure it will be observed that
the plate 44 carrying the wheel assembly is secured to
found that with the apparatus as shown in FIGURE 1
the leading edge of hopper wall 26 by means of an inter
which includes a plurality of tamping devices 25 to be de—
scribed, large size aggregates of the order of 6 in. and even 55 mediate plate 45 and four bolts 46 extending through
cooperating openings in the plates 44 and 45. The inter
larger, can be laid quickly and easily without the evidence
mediate plate 45 is attached to a mounting plate 47 ?xed
of drag marks and at the same time‘ providing a more
to the hopper 16, the attachment being accomplished by
compact, uniform layer of stone that will furnish a high
bolts 48 or other suitable fastening means engaging co
degree of support for any overlying structure.
More speci?cally, the novel and improved aggregate 60 operating opening in plates 45 and 47. The sets of open
ings securing bolts 46 and 48 are on equal centers so that
spreading apparatus 15 in accordance with the invention
the wheel supporting plate 44 can be secured directly to
includes a spreader box having a front wall 26, a rear
the hopper plate 47. The plate 47 includes at least one
wall 27 and side walls 28 and 29. The rear wall 27 must
additional set of holes 49 for attachment of the plates 44
be heavy enough to support the tamping assembly gen
45 as the case may be to adjust the height of the
erally denoted by the numeral 25 and withstand the pres 65 or
hopper 16.
sure produced by the deposition of stone ‘within the
With the wheel mounting as described above, either or
spreader box. In the illustrated embodiment of the in
both wheels may be mounted in positions as shown in
vention a reinforcing structure 30 is employed, though
FIGURE 12 so that the adjoining side wall of the hopper
caught beneath the striker or leveling plate and leave deep
grooves in the ‘surface of the stone layer. It has been
it is evident that the wall 27 may be made of a suf?
16 can be guided close to a prior course C during the
ciently heavy gage material for the attainment of the 70 laying ‘of an adjoining parallel course. This procedure
desired ends. The bottom edge 31 of the rear wall 27
(generally served in prior apparatus as leveling means,
and its height from the ground surface G determined the
thickness of the course. In‘ the instant embodiment of
the invention, the tamping devices 25 effect the leveling 75
minimizes the gap or space between adjoining courses
which is ?lled by adjustment of a side gate 85 which per
mits the discharge of su?icient stone to ?ll the gap and
form a continuous uninterrupted surface throughout the
area of the two or more parallel courses.
3,058,404
5
6
Steering of the wheels 19 is effected by a hydraulic
cylinder 50 pivoted at one end to the side wall 29 of the
tampers 60 are inclined relative to the striker plate 67 at
about 10 to 15 degrees and the throw of the tampers is
approximately one inch with the uppermost position of
hopper and at the other end to a link 51. The link 51 is
carried by a transverse shaft 52 spanning the hopper and
journalled to the side walls 28 and 29. The lower end of
lever 51 (see FIGURES 2 and 12) is connected to a crank
arm 55 by a shaft 53, the arm 55 being pivoted to the wall
each tamper being slightly below the ‘lower edge 32 of the
rear wall 27. With this arrangement, the lower edges of
the series of tampers 6tl ‘form the striking edge which
effects the actual leveling operation. It will also be ob
29 at '55’. The upper end of the arm 55 is connected to
a bracket 19’, secured to the wheel fork 41, by ‘a rod 54.
served in the embodiment of the invention shown in FIG
URES 8 through 10, for instance, that adjoining tampers
Thus actuation of cylinder 50 will shift the angular posi
60 are phased at 180 degrees so that when one alternate
tion of the wheel 19 shown in FIGURE 12. Operation of
set of tampers is in the uppermost position as shown in
the other wheel 19, as viewed in ‘FIGURE 1 is accom
FIGURE 9, the intervening set of tampers 60 is in the
plished by a link 56 carried by rod 52. and connected to the
lowermost position.
wheel fork by a rod 57.
In actual operation oscillation of the tampers is carried
As discussed above it has been found that relatively 15 out at a rate of approximately 400 reciproeations per
large aggregate of the order of 6 in. and even larger can
minute, which has been found particularly advantageous
be laid mechanically to form courses for supporting over
for laying large aggregate as, for instance, stone of the
lying structures by utilization of the novel and improved
order of 6 in. and even larger.
The action of the tampers 60 may be observed more
tamping means in accordance with this invention and de
noted generally in FIGURE 1 by the numeral 25. This
tamping means is shown more clearly in FIGURES 3 and
clearly in FIGURE 8. The stone S within the hopper 16
falls downwardly through the opening in the hopper as
previously described and onto the ground surface G. In
so doing, the uppermost stones slide downwardly past the
Referring now to these ?gures, a plurality of tampers
tampers and the lower edge of the tampers engage and
69 are spaced along the ‘back side of the rear wall 27 and
are inclined relative thereto. Vertical reciprocation of 25 push the stone downwardly so that they cannot engage and
be carried by the edge 31 of the rear wall 27. In addition,
the tampers is effected by a cam shaft generally denoted
the vibration imparted to the stone as it is being laid on
by the numeral 61. In the embodiment of the invention
the ground surface by reason of the action of the tampers
illustrated in FIGURES 8 through 10, the tamper mount
60 causes the stone to nest snugly to form a dense, uni
ing means includes an elongated strip 63 ?xedly secured
form layer. Actual tests with apparatus in accordance
along the bottom edge of the rear wall 27 and inclined
with the invention have clearly demonstrated the substan
relative thereto. The bottom edge of the strip 63 is
8 through 10.
preferably ‘welded to the striker plate and the upper edge
of the strip 62 is spaced from the striker plate by a spacer
bar 63 welded to the striker plate and to the top edge of
the strip 62. A plurality of spacer plates 63’ are secured 35
at intervals to the strip 62 and are spaced apart a distance
tial utility of this invention and have shown conclusively
that large aggregates can be successfully laid to produce
a resultant smooth, dense layer of stone that a?ords a
more stable ‘base for roadways and other purposes than
has been obtainable with prior mechanical devices. In
actual demonstrations laying stone of the order ‘of 6 in.
to produce a base course about 13 in. in thickness, inter—
slightly greater than the width of the tampers 60. These
spacer plates are welded to the strip 62 though it is evident
that they may be secured in any desired manner. A series 40 ruptions of tamper operation produced gouges and de
pressions in the resultant surface of as much as 8 to 10
of bridging plates 64 span the spacer plates 63 ‘and are
in. and the resultant surface was so uneven that it would
welded thereto. With this arrangement the strip 62, the
be unsatisfactory for any purpose. Upon subsequent
spacer plates 63 and the spanning plates 64 de?ne a plu
operation of the tampers a uniform, dense base course
rality of inclined slots slidably receiving the tampers 64}.
The cam shaft ‘assembly includes a transverse rod 65 45 was produced having a smooth, uninterrupted surface.
In the provision of base courses for roadways, and
rotatably carried by a plurality of journals 66 secured to
particularly for modern highways, it is necessary to lay
the rear wall 27 of the hopper 16. Power is supplied to
two or more parallel courses in order to cover the com
the shaft 65 by means of a drive shaft 67 connected
plete roadway width. For this purpose, the invention
through a universal joint 68 to a pinion gear 69. The
gear 69 meshes with a second cooperating gear 70 carried 50 further includes a pair of side gates 85 slida-bly carried by
channels 86 to open and close openings 87 in the sides of
by a. countershaft 71. A sprocket 72 on the countershaft
the hopper 16. The gate 85, as shown in FIGURE 1 is
71 is coupled by a chain 73 to a second sprocket 74 se
in the closed position and may be raised by any suitable
cured to the shaft 65. The shaft 65 is provided with a
means, as for instance, a chain 88 which engages a co
plurality of eccentric cams 75 that are locked in position
by a key 76 and each cam includes a pair of side plates 55 operating hook 89 on the upper edge of the hopper 16.
With this arrangement and with at least one wheel 19
77 with one of the plates having a hub 78 pinned to the
of the hopper displaced inwardly as shown in FIGURE
shaft 65 by a pin 79
3, the associated side gate 85 will discharge sufficient
In this embodiment of the invention each cam 75 func
stone to completely ?ll the gap between successive stone
tions to reciprocate one of the tamper plates 60 and this is
accomplished by a connecting rod 81} which includes a 60 courses. This avoids the necessity of a separate opera
tion ‘for ?lling spaces between the courses prior to further
split bearing assembly 81 surrounding the cam 75 and
slidably engaged therewith. The two halves of the bearing
treatment of the courses in the usual maner to insure
81 are held together ‘by an appropriate fastening means
such as bolts 82. The lower end of the connecting rod
80 is provided with an enlarged portion 83 having an
complete compaction of the stone and ?ll the interstices
with ?ller material such as sand, clay and the like.
In certain instances it may be desirable to reduce the
width of the base course to- be laid by the spreading ap
paratus 15 in accordance with the invention. In such
instances, a ?ller plate generally denoted by the numeral
96 and illustrated in FIGURE 6 may be inserted in one
or both ends of the hopper 16. The ?ller plate is gen
erally rectangular and has one inclined side for coopera
tion with the sloping baffle 34. With the ba?ie arranged
in the manner illustrated in FIGURES 5 and 6, the width
of the hopper is reduce-d to substantially 2/3 of the original
75 width. It is apparent that different sizes of baffles 90
opening 84 extending therethrough for the receipt of a
wrist pin 85 carried by the upper end of the tamper 60.
With this arrangement, as the shaft 65 is rotated, the con
necting rod 80 is reciprocated by the cam 75 and func
tions through the wrist pin 85 to reciprocate the asso
ciated tamper 60.
In accordance with the invention, the tampers 60 are
positioned to engage the aggregate in the course of laying
to compact it and prevent individual pieces from being
carried along by the hopper. In the instant case, the
3,058,404
may be employed and fastened in position in any suit
able manner as, for instance, by the provision of a ?ange
91 having a threaded opening therein for attachment to
by welding or other suitable means. The plate 102 is ?rmly
welded to the spacers 103 and thus forms a series of
tamper receiving slots in which the tampers are re
the side Wall 29 by a screw 92 or other suitable means.
ciprocated during operation of the apparatus. While the
A modi?ed embodiment of the invention is illustrated
in FIGURE ll of the drawings. This embodiment is
plate 102 is illustrated as being in the form of a single
elongated strip, it can be formed in sections bridging the
along the lines of the embodiment previously described,
spacer plates 103 in the same manner as illustrated in
FIGURE 9. The tampers are operated in the manner
described in connection with the previous embodiments ’
tive to the rear wall 27 at an angle substantially greater
than the angle shown, for instance, in FIGURE 8. The 10 of the invention by means of a shaft 65 carrying a plural
ity of eccentric cams 75. Each cam carries a connecting
connecting rod 80 and cooperating cam 75 in this ?gure
rod 80 having a bearing 81 slidably engaging the cam and
are substantially identical to the corresponding elements
a tubular bearing portion 83 ‘for engaging a wrist pin 85
of FIGURE 8 except for the fact that the cam 75 is ar
with the exception that the tampers 60 are inclined rela
ranged to produce somewhat increased displacement of
carried by the tampers 60.
,
In this embodiment of the invention the cams 75 are
the tamper 60. It will be observed that in FIGURE 11 15
phased at 120 degree intervals and the operation of three
the tamper 60 in its raised position has its lower end sub
successive tampers with this cam arrangement is shown
stantially in line with the rear wall 27 and when in the
in FIGURE 15. The tampers 60 to the left as viewed in
extended position as shown in dotted outline, the end of
FIGURE 15 is shown in the upper, dead center position.
the tamper 65 is disposed forwardly of the rear wall 27.
The center tamper 60 is moving downwardly as indicated
In this way the operable edge of the spreading means 15
by the arrow and the right hand tamper 60 has just passed
is formed by the lower edges of the tempers 60.
the dead center bottom position and is proceeding in an
In both of the embodiments of the invention previously
upward direction as indicated by the arrow.
The utilization of a plurality of tampers as illustrated
that the two alternate tampers vwere phased 180 degrees
apart. It is evident that any desired sequence of cam 25 in the drawings permits the application of greater forces
to the aggregate being laid to secure a highly uniform
operation may be employed, for instance, the cams may
and dense layer on the road bed. The optimum number
be phased at 15 degree, 30 degree, 60 degree, or even 120
of tampers for use in a given application will depend in
degree angles depending on the number and arrangment
part on the width of the equipment and in part on the
of cams. In actual tests, with the apparatus as shown, for
described, the earns 75 were positioned on the shaft 65 so
instance, in FIGURE 1 through 10, approximately ten
force desired for laying and compacting the aggregate.
individual tampers were employed with each tamper be
In any case it is generally desirable to use three or more
ing roughly 12 in. long and spaced from adjoining tamp
individual tampers reciprocated in the manner described
above for e?ective and e?icient operation.
In certain applications it may be desirable to provide a
ers a distance of about 2 in.
While the utilization of a large number of tampers is
ordinarily desirable, the advantages of the invention can 35 layer of aggregate of non-uniform thickness throughout
the width of the layer and this end may be accomplished
be obtained by the utilization of fewer tampers of in
by the structure shown diagrammatically in FIGURE 16.
creased width, it being essential, however, that the temp
ers be placed in a position to engage the stone being laid
and displace it in a manner that will prevent it from being
In this embodiment the tamper-s are slidably carried by
the back or rear wall or plate 27 as in the case of the
dragged by the spreader box and, at the same time, drive 40 previous embodiments of the invention. The drive or
it downwardly with a force that will cause the resultant
cam shaft 65 of the previous embodiments has been re
stone layer to be relatively tightly packed.
placed by two separate shafts denoted herein by the nu
. A still further embodiment of the invention is illustrated
merals 110 and 111. The shafts are in end to end rela
tionship with the inner or adjoining ends carried by a
in FIGURES 13 through 15. In these ?gures the,
elements corresponding to elements of the previous em 45 pivotally mounted bearing assembly generally denoted by
the numeral 112 and ?xed to the plate 27. The outer
bodiments of the invention have been denoted by like
ends of the shafts are carried by journals 113 and 114
numerals.
'
adjustably carried by slots 115 and 116 in the plate 27
Referring ?rst to FIGURE 14, it will be observed that
or other similar supporting member. The vertical posi
the tamper 60 has its lower edge 60' disposed at all times
tions of the journals 115 and 116 are selected by opera
forwardly of the hopper box wall 27. In this way, the
tion of suitable adjusting means ‘117 and 118 that will
tampers 60 effect the complete operation of levelling and
move the journals and associated shaft sections up
tamping the aggregates being laid. The tamper support
wardly and downwardly as indicated by the arrows 119
ing means comprises an elongated strip 100 of steel or
and 120 and also serve to lock the journals in the selected
other material welded to the backside of the plate 27 at
an angle of roughly 25 degrees. The strip 100 is sup
position. Movement of the shaft sections will also dis
place the tampers 60 a proportional amount and thereby
ported throughout its length by a series of wedge-shaped
enable a variety of surface con?gurations of the deposited
braces ‘101 welded to the strip 100 and to the plate 27.
layer to be obtained. This is desirable particularly in the
The lower edge of the plate is beveled as indicated to
laying of base courses of roadways in order to produce
minimize the spacing between the forward surface of the
60 for instance the desired slope for curved sections and
tampers 60 and the lower edge 31 of the plate 27.
crowns for straight sections.
A second elongated strip 102 also of steel or other simi~
lar material is supported in spaced relationship to the
While only certain embodiments of the invention have
plate v100. The strip 102 is somewhat wider than the strip
been illustrated and described, it is evident that modi
100 and extends downwardly to a point generally in line
?cations, changes and alterations may be made without
with the lower edge 31 of the plate 27. The strip 102 65 departing from the true scope and spirit thereof as de
?ned by the appended claims.
is held in position by a series of spacer bars 103‘ that are
secured to the strip 100 at intervals slightly greater than
What is claimed is:
_
the width of the tampers 60. The thickness of these bars
' 1. Apparatus for spreading aggregates comprising a
is also slightly greater than the thicknessof the tampers.
hopper for receiving and spreading aggregate, said hop
The lower ends of the bars 103 are tapered as indicated 70 per including a rear wall and a bottom outlet forwardly
at 103’ and extend substantially to the lower edge of the
of said rear wall, a plurality of guides carried in spaced
strip 102 to afford maximum support ‘for the strip. A
relationship along the lower edge of said rear wall, a
plurality of bracing plates 104 are welded to the tops of
tamper plate carried in each guide with the tamper plate
the spacer plates 103 and the top edge of the strip 100
being closely embraced by its associated guide to restrict
and extend inwardly to the plate 27 for attachment thereto 75 movement of the tamper plate to a substantially linear
3,058,404
10
path with the lower edge of each tamper plate being mov
hopper for receiving and spreading aggregate, said hop
able to and from a position below said rear wall whereby
per including a rear wall and a bottom outlet forwardly
of said rear wall, a plurality of guides carried in spaced
said tamper plates constitute a striker edge for spreading
and compacting said aggregate, and means mechanically
relationship along the lower edge of said rear wall, a
coupled to said tamper plates for reciprocating said plates
in their respective paths and with each of said tamper
tamper plate carried in each guide with the tamper plate
being closely embraced by its associated guide to restrict
plates being reciprocated in out-of-phase relationship with
the adjoining tamper plates.
movement of the tamper plate to a substantially linear
path with the lower edge of each tamper plate being
2. Apparatus for spreading aggregates comprising a
movable to and from a position below said rear wall
hopper for receiving and spreading aggregate, said hop 10 whereby said tamper plates constitute a striker edge for
per including a rear wall and a bottom outlet forwardly
spreading and compacting said aggregate, a transverse
driven shaft carried in spaced relationship to the upper
ends of said tamper plates, eccentric cams carried by
said shaft with each cam in alignment with an associated
tamper plate being closely embraced by its associated 15 tamper plate, a link having a cam receiving bearing there
guide to restrict movement of the tamper plate to a sub
in embracing each cam, and means pivotally connecting
stantially linear path with the lower edge of each tamper
each link to one of said tampers, each of said cams being
plate being movable to and from a position below and
in out-of-phase relationship with its adjoining cams
in close proximity to said rear wall whereby said tamper
whereby rotation of said shaft causes out-of-phase recip
plates constitute a striker edge for spreading and corn 20 rocation of said tampcrs.
pacting said aggregate, and means mechanically coupled
6. Apparatus according to claim 5 wherein said shaft
to said tamper plates for reciprocating said plates in their
is formed of two end-to-end sections and said apparatus
respective paths and with each of said tamper plates
further includes means for angularly adjusting the axes
being reciprocated in out-of-phase relationship with the
of the shafts one relative to the other to modify the con
adjoining tamper plates.
25 tour of the striker edge.
3. Apparatus for spreading aggregates comprising a
hopper for receiving and spreading aggregate on a sur
References Cited in the ?le of this patent
face, said hopper including a rear wall and a bottom
UNITED STATES PATENTS
outlet forwardly of said rear wall, a plurality of Iverti
of said rear wall, a plurality of guides carried in closely
spaced relationship along the rear lower edge of said
rear wall, a tamper plate carried in each ‘guide with the
cally disposed guides carried in spaced relationship along
30
the lower edge of said rear wall, said guides being in
clined relative to said surface with the lower portion of
said guide being disposed forwardly of the upper portion
of the guide, a tamper plate carried in each guide with
the tamper plate being closely embraced by its associated 35
guide to restrict movement of the tamper plate to an
992,649
1,887,341
Gale ________________ __ May 16, 1911
Venable ______________ __ Nov. 8, 1932
1,974,013
2,012,784
2,035,627
2,109,020
Clausen _____________ __ Sept.
Barber ______________ __ Aug.
West _______________ __ Mar.
Abernathy ___________ __ Feb.
2,215,455
Abernathy et a1 _______ __ Sept. 24, 1940
2,245,426‘
inclined and substantially linear path with the lower edge
2,249,264
of each tamper plate being movable to and from a posi
2,267,022
tion below said rear wall whereby said tamper plates
constitute a striker edge for spreading and compacting 40 2,333,041
2,351,592
said aggregate, and means mechanically coupled to said
2,511,589
tamper plates for reciprocating said plates in their re—
2,762,276
spective paths and with each of said tamper plates being
reciprocated in out-of-phase relationship with the adjoin
ing tamper plates.
4. Apparatus according to claim 3 wherein the lower
edges of said tamper move to and from positions below
and forwardly of the lower edge of said rear wall.
5. Apparatus for spreading aggregates comprising a
2,842,036
45
18,
27,
31,
22,
1934
1935
1936
1938
Baker _______________ __ June 10, 1941
Baily ________________ __ July 15, 1941
Gledhill _____________ __ Dec. 23, 1941
Poulter _______________ __ Oct. 26,
Barber ______________ __ June 20,
Jaeger ______________ __ June 13,
Mauch ______________ __ Sept. 11,
Overman ______________ __ July 8,
1943
1944
1950
1956
1958
FOREIGN PATENTS
464,548
Italy _________________ __ July 2, 1951
514,341
751,288
775,284
Italy __________________ __ Feb. 9, 1955
Great Britain _________ __ June 27, 1956
Great Britain _________ __ May 22, 1957
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